DAD: Upon inputting a sender's identity [ID.sub.s], the ciphertext
[sigma], and a receiver's private key [mathematical expression not reproducible], the receiver calculates [mathematical expression not reproducible], obtaining either the message m or [perpendicular to] when [sigma] is an invalid ciphertext
Their FHE scheme is constructed from a somewhat homomorphic scheme, a scheme that can evaluates low degree polynomial on ciphertext
. To achieve fully homomorphic properties, they have implemented squashing technique introduced by Gentry.
After the cloud server receives the request f(), it runs Eval and outputs the resulting ciphertext
[??] to the requester.
; and the password, i.e., the secret information needed to
Input : a ciphertext
[CT.sub.F], a file tag value [Tag.sub.F], a secret key [mathematical expression not reproducible] Output : an expected response array [ResArr.sub.Clt] (1) for i in [1, 3] (2) [mathematical expression not reproducible] (3) for j in[1, t] (4) [mathematical expression not reproducible] (5) [mathematical expression not reproducible] (6) [mathematical expression not reproducible] (7) [sigma] [left arrow] [CT.sub.F][[[pi].sub.k](1)] [parallel] ...
The definitions assume that a set of attributes describes a group access structure and the ciphertext
embeds the access structure.
With the implementation, examine the computational time for STAMP, time with respect to packet size for blowfish algorithm and encryption and decryption time in Ciphertext
Policy Attribute Based Encryption method.
If an attacker wants to make replay attack in the same period, then it should modify [r.sub.0] in ciphertext
[mathematical expression not reproducible] that is also impossible.
(2) The encryption algorithm Enc(k,m): on inputting a key k [member of] K and a message m [member of] M, Enc outputs a ciphertext
c [member of] C
By (14), the plaintext equations, that is, the initial round equation system, can be obtained as (21), and the ciphertext
equations can be obtained as (22).
The DNA sequence is mainly used for ciphertext
diffusion as well as the generation of hash values.